Oregon lawmakers want to make parents think twice before deciding not to have their kids immunized. The Oregon Senate Thursday approved a measure that would add steps to the way parents can opt out of the requirement.

The Oregon Health Authority says more than six percent of children enter kindergarten without the required number of vaccinations. It has been the highest highest rate in the nation, and it's been climbing.

The number of whooping cough cases in Washington State has passed 3,000. Washington’s infection rate was rising so rapidly that health officials called on the Centers for Disease Control and Prevention for help. That was in May. Yesterday, the CDC issued a report on its findings. Scientists noticed an unusual pattern.